Components At The Dc Link; Braking Units - Siemens SINAMICS G130 Engineering Manual

To ensure that the converters comply with the limits defined for the above categories, it is absolutely essential that
the relevant installation guidelines are followed. The efficiency of the filters can be guaranteed only if the drive is
properly installed as regards grounding and shielding. For details, please refer to section "Line filters" in chapter
"Fundamental Principles and System Description", as well as to chapter "EMC Installation Guideline".
Line filters can be used only on converters that are connected to grounded supply systems (TN or TT with grounded
neutral). On converters connected to non-grounded systems (IT supply systems), the integrated standard line filter
must be isolated from PE potential. This can be done by removing a metal clip on the filter when the drive is
commissioned (see operating instructions). It is not permissible to use the optional line filters (option L00) in non-
grounded systems to achieve compliance with the limits defined for category C2 by EMC product standard EN
61800-3.

5.7 Components at the DC link

5.7.1

Braking units

SINAMICS G150 converter cabinet units have no regenerative feedback capability. Braking units are therefore
required for applications in which regenerative energy is produced occasionally and for brief periods, e.g. when the
drive brakes (emergency stop). The braking units consist of a Braking Module and an externally installed braking
resistor, which is connected to the Braking Module and converts generated braking energy into heat.
Braking units with a continuous braking power of 25 kW (P
converter cabinet units as option L61 and with a permanent braking power of 50 kW (P
L62. The table below lists the braking powers which match the output power ratings of individual converters. The
Braking Modules contain the power electronics and associated control circuitry. They are designed for being mounted
in the power blocks of the G150 cabinet units and are cooled by the air discharged from the power units. They are
connected to the DC link and operate completely autonomously in terms of the supply voltage drawn from the DC link
and closed-loop control. In order to achieve a higher braking power, it is possible to operate more than one Braking
Module in parallel on converters constructed of multiple power blocks. 2 Braking Modules can be used on converters
of frame size HX, and 3 Braking Modules on converters of frame size JX. The 2nd or 3rd Braking Module is not a
standard option and is therefore available only on request. A separate braking resistor is always assigned to each
Braking Module.
On converters with power units connected in parallel, a braking unit can be mounted in each partial converter. Option
L62 must be ordered twice for this arrangement. In this case as well, the parallel operation of multiple Braking
Modules per partial converter is also possible. The 2nd or 3rd Braking Module in each case is not a standard option
and is therefore available only on request. A separate braking resistor is always assigned to each Braking Module.
If braking units are used at ambient temperatures of > 40 °C and at installation altitudes of > 2000 m, the derating
factors relating to output current and output power as a function of the relevant degree of protection specified for
SINAMICS G150 cabinet units also apply.
A thermal contact, which can be incorporated into the alarm and shutdown sequence of the converter, is installed in
the braking resistor as a monitoring mechanism.
The maximum permissible cable length between the Braking Module in the converter and the braking resistor is
100 m.
SINAMICS G150
cabinet units
Rated power
380 V – 480 V 3AC
110 kW - 132 kW
160 kW - 900 kW
500 V – 600 V 3AC
110 kW - 1000 kW
660 V – 690 V 3AC
75 kW - 132 kW
160 kW - 2700 kW
Braking Modules and braking resistors available for SINAMICS G150 cabinet units. The power values are valid for the
factory-set upper response thresholds
Matching Braking Modules
Rated power Power
(continuous
braking power)
P P
DB 40
25 kW (option L61) 50 kW
50 kW (option L62) 100 kW
50 kW (option L62) 100 kW
25 kW (option L61) 50 kW
50 kW (option L62) 100 kW
Engineering Information
power 100 kW) are available for SINAMICS G150
20
Power Peak power
P P
20
100 kW 125 kW
200 kW 250 kW
200 kW 250 kW
100 kW 125 kW
200 kW 250 kW
SINAMICS Engineering Manual – November 2015
SINAMICS G150
power 200 kW) as option
20
Braking
resistor current
R
B
15
4.4 Ω ±7.5 %
2.2 Ω ±7.5 %
3.4 Ω ±7.5 %
9.8 Ω ±7.5 %
4.9 Ω ±7.5 %
319/528
Ó Siemens AG
Max.
189 A
378 A
306 A
127 A
255 A